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Capillary Rise In Tube

  1. Feb 9, 2015 #1
    What happen when the capillary rise occur in a tube of insufficient length?

    My teacher told me that hR = constant where h is height and R is radius of sphere of which the curved surface of meniscus firm a part.
    She also told me that if h become less so R has to increase so radius of meniscus has to be large.

    I didn't really get what she's meant.

    If we take a capillary tube of height h and put it in water then, the tube become filled with water till height h. Now if we break a tube to make it of height less than h then will water flow out?
     
    Last edited: Feb 9, 2015
  2. jcsd
  3. Feb 9, 2015 #2

    Bystander

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    This is homework.
    How large can the radius become? What does that imply?
    Work out the first question and the answer to this becomes obvious.
     
  4. Feb 9, 2015 #3
    I told that I didn't understand what the teacher told. Any link on web that explain it would be helpful.
    This is not a homework question.
     
  5. Feb 9, 2015 #4

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    I'll ask once more:
     
  6. Feb 9, 2015 #5
    I told that's what my teacher said. If I had known the meaning I wouldn't have asked the question.
     
  7. Feb 9, 2015 #6

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  8. Feb 12, 2015 #7
    I can tell that someone has not explained this to you very well, or you were not listening!

    All you need to know is that the curves of a meniscus are in effect pulling up the water, they are attracted to the glass. In a small tube the pulling area is a large proportion of the surface area and will be able to pull the water high and vice versa.
     
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